I'm an ex-member of the TF2F community, and one of the frequent and smartest posters on the forum, Chro, wrote an 18 page paper of the gameplay mechanics of TF2. http://www.teamfortress2fort.com/upload/tf2.pdf Orginal thread this was posted in. It's a great read, I hope alot of people will take a look. Knowing how TF2 works is the first step to making a nice map from a gameplay stand point. Enjoy.